Today i read about touchless
an opensource sdk microsoft has released. it enables you to track objects using a
simple webcam to create apps similar to a multitouch display.

then i spent about 20 minutes coding a processing sketch that does roughly the
same :-)

as you can see in the screenshot i cant affort the same cool toys the microsoft
coder has in the demo video, so i had to use some post-its instead

below is the complete sourcecode of the app. I didn't export it as an
applet this time, because the applet couldn't use the quicktime api. It also
only works on mac and windows this time, because processing uses the quicktime
api. on linux the gstreamer based replacement from codeanticode
can be used.

when the programm starts hold up 2 different colored items (use colors that do not appear in the background)
then click on the first color with the left mousebutton and on the second color using the right
mousebutton. and then enjoy the "minority report"-experience zooming and rotating the image :-)